The STA Pneumatic Clamping Machines at variable size are manufactured in four different version: STA-1500, STA-2000, STA-2500, STA-3000. Adjustable fence approach with screw rapid clamping system, dual push-button control and hand protection valve, adjustable fence return ensured by a single push button. Clamping pressure setting by means of a special regulator. Both STA-2500 and STA-3000 Models, equipped respectively with two and three hold-down cylinders, can be supllied on request with special support for clamping of jalousie windows.